First off I apologize for the novice question I'm about to ask. Long story short I acquired my grandpa's 44 A. I'm currently restoring I recently took the crank shaft out it was pretty rusty due to the cover missing on the tractor. I took it in to be welded and brought back to standard size. ( it was .020 under already). I'm not familiar with these babbit shimmed main bearings. They seem to be in pretty good shape. My question is if I bring the main journals back to standard size can just adjust the shims for clearance? Or is it necessary to find standard main bearings? Also how can you determine if the babbit material is still sufficient? I say the main bearings look good but that is just Me saying they are smooth